Can Jacoco CLI report be filtered via classfiles - jacoco

Question

Is it possible to report only for 1 or selective class(es) out of a jar file, So for example *.exec is recorded for an application but report is needed for only 1 class, now in --classfiles we can specify a JAR file like /path/trial.jar but not beyond that like /path/trial.jar/pkg1/class, Is there some option to do that.

Answer 1

<path> in --classfiles <path> is scanned recursively and all found class files are used for generation of report, so it can point not only on JAR files, but also on directories containing JAR files and class files, as well as can point on a single class file.
For example after compilation of Example.java
class Example {
class Inner {
}
public static void main(String[] args) {
}
}
into directory classes
javac Example.java -d classes
two class files will be produced as can be seen by command ls classes
'Example$Inner.class' Example.class
After generation of jacoco.exec
java -cp classes -javaagent:jacoco-0.8.0/lib/jacocoagent.jar Example
possible to generate report for whole classes directory using command
java -jar jacoco-0.8.0/lib/jacococli.jar report jacoco.exec --classfiles classes
and two class files will be analyzed
[INFO] Loading execution data file /tmp/example/jacoco.exec.
[INFO] Analyzing 2 classes.
or generate report for single Example.class using command
java -jar jacoco-0.8.0/lib/jacococli.jar report jacoco.exec --classfiles classes/Example.class
and only this class will be analyzed
[INFO] Loading execution data file /tmp/example/jacoco.exec.
[INFO] Analyzing 1 classes.
So you can unpack JAR file into directory and analyze separately whatever you want in it.